Having sold as many copies of her debut album Rockferry as there are people in Paraguay (6.5 million, stat fans), Duffy is back with a second album of modernist takes on a distinctly 60s pop-soul sound that ought to act as both nostalgia and a gateway drug for anyone not already familiar with Petula and Dusty. Endlessly is unlikely to repeat Rockferry's wildfire success – what could? – lacking as it does instantaneous radio killers. But Duffy's success has always been dependent on both her beautiful voice and her producers' ability to tap into boomer tastes with snippets of 60s pop and nods that drift from Lulu (in Well, Well, Well) to the more modern likes of Madonna. The Madge nod comes in the excellent Keeping My Baby, a take on single motherhood that's the obvious progeny of Papa Don't Preach. Albert Hammond Sr's production and Duffy's sweet voice make the LP a pleasant listen, but even the catchier moments – like the twinkling Girl and the possessive disco of My Boy – lack an emotional tug. A nice garnish for mum's stocking, if nothing else.